I absolutely hated Pelant because he disrupted their lives so much! But the gravedigger was the creepiest in my opinion. Plus she put their lives in danger much more than Pelant did. His torture was psychological and financial.

Broadsky - a sniper on par with Booth and not knowing when he was going to hit next, plus bc of Vincent sob. Good villain. Excellent actor. He's up there in my list of favorites.

And maybe Kovac from the final season if they could have fleshed him and his sister out a bit more. It was a good set up and callback to a conversation in past season between Booth and Brennan and someone from Booth's past. They just didn't have a lot of time to build up a lot of suspense with trying to wrap up all the other storylines. A full season/half season of that story arc alone would have made a difference.

Pelant was creepy and got under my skin with some of the episodes, but some of the storylines were a bit too far gone and it got me out of the creepiness too much. It's hard to explain really.

Gravedigger was creepy too, but I hated who they settled on as the Gravedigger. I didn't like her.

Gormagon was an overall good villain and kept them all on their toes, and was creepy. The damn ending where he jumps out of the closet at the lobbyist startles me EVERY.SINGLE.TIME. and I know it's coming.